CN105177559A - Salt-spray-resistant aluminum profile rare earth silane processing liquid and preparation method thereof - Google Patents

Abstract

The invention discloses salt-spray-resistant aluminum profile rare earth silane processing liquid. The salt-spray-resistant aluminum profile rare earth silane processing liquid is prepared from, by weight, 120-130 parts of CeCl37H2O, 180-190 parts of H2O2, 3.3-3.5 part of phytic acid, 1.8-2 parts of zinc polysilicate, 0.8-1.1 parts of glucose, 0.5-0.6 part of clove oil, a proper amount of deionized water, 1-1.2 parts of tetraethylortho silicate, 5-5.2 parts of methyl triethoxysilane, 50-53 parts of ethyl alcohol, 10-11 parts of ammonium hydroxide, 15-15.6 parts of polyacrylate emulsion containing siloxane fluorine (FSiPA) and 2-2.5 parts of nanometer zirconium dioxide. Micro holes and cracks in the surface of a film formed through the processing liquid are obviously reduced, compactness is greatly improved, certain hydrophobicity is achieved, the corrosion speed is decreased, and coating performance is improved; and by using phytic acid, zinc polysilicate, glucose and clove oil, film forming performance is good, a film layer is compact and good in corrosion resistance, salt spray resistance time is 49 h, and the corrosion area ratio is smaller than 5%.

Description

A kind of salt spray resistance aluminium section bar rare earth silane treatment solution and preparation method thereof

Technical field

The present invention relates to chromium-free metal surface treatment agent technical field, particularly relate to a kind of salt spray resistance aluminium section bar rare earth silane treatment solution and preparation method thereof.

Background technology

Aluminium surface rare earth conversion film and silane conversion film by extensive concern, and are expected to alternative chromate conversion coating as first-generation metal process for treating surface.Rare-earth conversion coatings has higher bonding strength as inhibiter, and resistance to persistence is good, but easily dehydration cracks, and has a strong impact on corrosion resisting property.And silane conversion film has superhydrophobic property, even compact, effectively can stop medium to be invaded and produce corrosion to matrix, but this rete poor durability, once destroying, corrosion resisting property lost efficacy rapidly.By the mutual supplement with each other's advantages using rare earth silane composite film to achieve above-mentioned two kinds of retes, can to provide effectively for aluminum substrate, the corrosion prevention of environmental protection.Determined the optimal processing parameter of rare earth silane complex film by orthogonal test: CeCl37H2O concentration is 40g/L, and silane concentration is: 3g/L, H2O2 concentration is: 60ml/L, pH are: 4.0, and temperature is: 35 DEG C, film formation time is 10min.Use the analysis means such as scanning electron microscope, EDS, polarization curve, CA tester, the surface topography of the rare earth silane complex film under optimum process condition, chemical constitution, Elemental redistribution, chemical property and hydrophobicity are studied, and have carried out corresponding comparison to simple Cerium conversion film.Research draws, composite film is than simple Cerium conversion film even compact more, and surface does not almost have obvious crackle, compensate for Cerium conversion film and easily to dewater the deficiency of chapping, improve rete overall performance.

But the intensity of this rare earth silane complex film, wear resistance, compactness, erosion resistance are not enough, do not reach the performance of chromate conversion coating, need to improve.

Summary of the invention

The object of the invention is exactly the defect in order to make up prior art, provides a kind of salt spray resistance aluminium section bar rare earth silane treatment solution and preparation method thereof.

The present invention is achieved by the following technical solutions:

A kind of salt spray resistance aluminium section bar rare earth silane treatment solution, is made up of the raw material of following weight part: CeCl ₃7H ₂o120-130, H ₂o ₂180-190, phytic acid 3.3-3.5, zinc polysilicate 1.8-2, glucose 0.8-1.1, Syzygium aromaticum stem oil 0.5-0.6, deionized water are appropriate, tetraethoxy 1-1.2, Union carbide A-162 5-5.2, ethanol 50-53, ammoniacal liquor 10-11, fluorine silicon polyacrylate dispersion 15-15.6, nano zirconium dioxide 2-2.5.

The preparation method of described salt spray resistance aluminium section bar rare earth silane treatment solution, comprises the following steps:

(1) by fluorine silicon polyacrylate dispersion, tetraethoxy, Union carbide A-162, ethanol, nano zirconium dioxide, Syzygium aromaticum stem oil mixing, 1-1.4h is stirred under normal temperature, 250-300r/min condition, then ammoniacal liquor is slowly dripped in people's said mixture, after stirring reaction 6-6.5h, obtain emulsion;

(2) by CeCl ₃7H ₂o is mixed with the solution that concentration is 40g/L, then adds H by 60ml/L ₂o ₂, then add the emulsion and other remaining components that 3-3.2wt% (1) step obtains, stir, regulate pH=4.0, supersound process 3-4min under ultrasonic cell disruptor, to obtain final product.

First aluminium section bar is carried out pre-treatment during use, then be immersed in treatment solution by aluminium section bar and carry out Passivation Treatment, temperature is 30-40 DEG C, and process 10-12min, takes out, and rinses with water, dries.

Advantage of the present invention is: treatment solution of the present invention makes emulsion by using the raw materials such as fluorine silicon polyacrylate dispersion, nano zirconium dioxide, make treatment solution good film-forming property, micropore and the crackle on film surface all obviously reduce, compactness is greatly improved, and there is certain hydrophobic performance, slowing down corrosion speed, improves coating performance; By using phytic acid, zinc polysilicate, glucose, Syzygium aromaticum stem oil, good film-forming property, rete is fine and close, corrosion-resistant good, and during salt fog 49h, corroded area ratio is less than 5%.

Embodiment

A kind of salt spray resistance aluminium section bar rare earth silane treatment solution, is made up of the raw material of following weight part (kilogram): CeCl ₃7H ₂o120, H ₂o ₂180, phytic acid 3.3, zinc polysilicate 1.8, glucose 0.8, Syzygium aromaticum stem oil 0.5, deionized water appropriate, tetraethoxy 1, Union carbide A-162 5, ethanol 50, ammoniacal liquor 10, fluorine silicon polyacrylate dispersion 15, nano zirconium dioxide 2.

The preparation method of described salt spray resistance aluminium section bar rare earth silane treatment solution, comprises the following steps:

(1) by fluorine silicon polyacrylate dispersion, tetraethoxy, Union carbide A-162, ethanol, nano zirconium dioxide, Syzygium aromaticum stem oil mixing, 1h is stirred under normal temperature, 250r/min condition, then ammoniacal liquor is slowly dripped in people's said mixture, after stirring reaction 6h, obtain emulsion;

(2) by CeCl ₃7H ₂o is mixed with the solution that concentration is 40g/L, then adds H by 60ml/L ₂o ₂, then add the emulsion and other remaining components that 3wt% (1) step obtains, stir, regulate pH=4.0, supersound process 3min under ultrasonic cell disruptor, to obtain final product.

First aluminium section bar is carried out pre-treatment during use, then be immersed in treatment solution by aluminium section bar and carry out Passivation Treatment, temperature is 35 DEG C, and process 12min, takes out, and rinses with water, dries.

The powdery paint for aluminum profile of this embodiment is carried out electrostatic spraying, and coat-thickness is 95 μm, according to GB/T8013.3-2007 method, spraying sample is placed in boiling water and boils 2 hours, through observe coating without coming off, bubble, wrinkling;

According in GB5237.4-2008 to the corrosion resistance test of Electrostatic Spraying of powder Coatings film: after the test of 1000 hours acetic acid salt spray, the coatingsurface after visual inspection test, bubble-free, comes off, and two side forms of the ruling limit permeating corrosion that places an order is no more than 4 millimeters.

Claims (2)

1. a salt spray resistance aluminium section bar rare earth silane treatment solution, is characterized in that being made up of the raw material of following weight part: CeCl ₃7H ₂o120-130, H ₂o ₂180-190, phytic acid 3.3-3.5, zinc polysilicate 1.8-2, glucose 0.8-1.1, Syzygium aromaticum stem oil 0.5-0.6, deionized water are appropriate, tetraethoxy 1-1.2, Union carbide A-162 5-5.2, ethanol 50-53, ammoniacal liquor 10-11, fluorine silicon polyacrylate dispersion 15-15.6, nano zirconium dioxide 2-2.5.

2. the preparation method of salt spray resistance aluminium section bar rare earth silane treatment solution according to claim 1, is characterized in that comprising the following steps:

(1) by fluorine silicon polyacrylate dispersion, tetraethoxy, Union carbide A-162, ethanol, nano zirconium dioxide, Syzygium aromaticum stem oil mixing, 1-1.4h is stirred under normal temperature, 250-300r/min condition, then ammoniacal liquor is slowly dripped in people's said mixture, after stirring reaction 6-6.5h, obtain emulsion;

(2) by CeCl ₃7H ₂o is mixed with the solution that concentration is 40g/L, then adds H by 60ml/L ₂o ₂, then add the emulsion and other remaining components that 3-3.2wt% (1) step obtains, stir, regulate pH=4.0, supersound process 3-4min under ultrasonic cell disruptor, to obtain final product.